Specifications
The Rack Monitor 88XX is a loading rack monitoring system, detects and communicates a pending overfill condition
to the loading rack control automation equipment by means of a normally open relay contact. In addition, this non-
permissive condition as well as diagnostic information is displayed. A typical system contains loading rack control
monitor (88XX Rack Monitor) and a API 10 wire screened coiled cable with a black 10 pins 4 J-slot plug (Model
7400E).
Sensor signal inputs allow compatibility with the NEN-EN13922 and two other API standard signalling conventions
commonly used in the industry. Either of these signals comes from the truck/trailer mounted onboard control
monitor or sensors. The 88XX rack monitor supersedes the 84xx,813x and 85xx type rack monitors and are suitable
for hazardous locations with intrinsically safe outputs.
Not all depots are the same and sometimes extra functionality is required. The 88XX has been designed to fulfil that
extra functionality. Add-ons can be placed in spare sockets. E.g. a MODBUS add-on can be simply added to the
existing rack monitor when required in a later state.
There are multiple versions available. (ask OPW for possibilities).
The 8851 is a most basic rack monitor for 5-wire sensor in the range. It can be set (by means of a dip switch) in the
8130 mode. In this mode the light-indicators react the same as the previous 8130 rack monitor. The 8821 is
designed to detect 2-wire sensors.
(Note 1)
The Rack Monitor 8870E is a complete auto-switching version with
Organic Led display. The installation of all versions are the same.
NOTE 1: Thermistor sensors are not supported!
Thermistor sensors are heating elements with a temperature sensor. A certain amount of power is applied
to keep the sensor tip within a around ~75ºC 167ºF. Temperature will drop as soon as the glass tip comes
in contact with fluid. These sensors are not commonly used anymore and are superseded with 2-wire
optical sensors. (e.g 2-wire quick-start sensor). See below for further explanation.
Electrical Specifications
Mains
Nominal min. input voltage : 90 Vac.
Nominal max. input voltage : 250 Vac.
Nominal input current : 50 mA
RMS
@ 230 Vac
Frequency : 50 / 60 Hz
Nominal power consumption : 15VA.
Mains current limitation
internal fuses : 1AT
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